Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual era o nome da equipe visitante no Jack Murphy Stadium?
 ###Tabelas: CREATE TABLE mcgwire’s_rookie_record_49_home_runs (mcgwire’s_rookie_record_49_home_runs_id AUTO_INCREMENT PRIMARY KEY, Home Run INT, Game INT, Date VARCHAR, Inning VARCHAR, Location VARCHAR, Opposing Pitcher VARCHAR, Team VARCHAR) CREATE TABLE stations_under_construction (stations_under_construction_id AUTO_INCREMENT PRIMARY KEY, Station VARCHAR, Extension VARCHAR, City/Neighborhood VARCHAR, Projected opening INT, Transit Connections VARCHAR, Park and ride? VARCHAR) CREATE TABLE 1990 (1990_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Visiting Team VARCHAR, Final Score VARCHAR, Host Team VARCHAR, Stadium VARCHAR) CREATE TABLE singles:_26__19_titles_7_runners-up (singles:_26__19_titles_7_runners-up_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Surface VARCHAR, Opponent in the final VARCHAR, Score in the final VARCHAR) CREATE TABLE fsfe_examination_result_analysis_–_2009 (fsfe_examination_result_analysis_–_2009_id AUTO_INCREMENT PRIMARY KEY, Subject VARCHAR, No. Sat INT, No. Passed INT, % Pass INT, Highest mark INT, Lowest mark INT, Mean INT)  
SELECT Visiting Team FROM 1990 WHERE Stadium = jack murphy stadium